Sash fastener



arch 3, 1936. A. DERSHEM Zggj@ sAsH FASTENER Filed May 29, 1934 Patented Mar. 3, 1936 UNITED STATES PATENT QFFIQE SASH FASTENER James A. Dershem, Orchard, Colo.

Application May 29,

4 Claims.

My invention relates to a sash fastener and it consists in the constructions, arrangements and combinations herein described and claimed.

It is the main object of my invention to provide a'sash fastener operable through wind pressure from the exterior, so that the window will automatically close.

It is also an object to provide a device in which the mechanism thereof may be readily adjusted to withstanding varying wind pressures.

It is a still further object of the invention to provide a structure which may be readily installed in new or old windows now in use, and which may be applied to either upper or lower sashes of the window.

Additional objects, advantages and features of invention will be apparent from the following description and accompanying drawing, wherein Figure 1 is a vertical section through a portion of a window and sash, showing the device installed, the window being in open position.

Figure 2 is a similar view, showing the window closed.

Figure 3 is an enlarged sectional view through the mechanism.

Figure 4 is a cross sectional view at right angles to Figure 3.

There is illustrated a window frame generally indicated at I0, which includes a sliding sash I I, guided as customary by guide strips I3 upon the opposite sides of the sash.

In the present instance, the invention is shown applied to a lower sash, but obviously the device may be equally well applied to the upper sash, and as the operation of the device is similar in each instance, the description of the device as applied to the lower sash is believed sufficient. In either case, the window sash must be capable of moving to its closed position of its own accord or by the use of counterweights or similar means, as would be the case where the fastener is incorporated in an upper sash, the counterweight being capable of drawing the sash to its closed position.

This sash II has its cross rail I2 cut away, as at I2', to accommodate the housing I4, the cut away portion extending from one vertical edge of the sash inwardly into the body thereof as well as transversely therethrough and suitable screws I5 are employed to secure the housing in position.

The housing I4 is preferably formed in two parts A and B as shown in Figure 4, the member A having a pair of longitudinal parallel bores I6 and I'I, spaced in a vertical direction, one above the other. These bores I6 and II are formed in 1934, Serial No. 728,175

the member A at such points that they intersect an edge I8 of a recess I9, thereby forming slots 2B, establishing communication between respective bores and the recess B9.

Within the bore l5, I provide a plunger 2 I having a tooth 22 upon its outer end, adapted to engage with teeth 23 of a rack bar 2li, fixed to the weather side of the frame il). The plunger 2| is normally maintained in projected position by virtue of a helical spring 25 seated within the bore. The bore I6 is closed at its other end by a screw plug 26 which is in bearing engagement with the spring 25. The plug 26 aiords a ready means for adjusting the tension of the spring so that the device may be adjusted to operate for closing the Window at varying wind pressures. The inner guide strip I3 may be provided with a recess 2l at a suitable point to permit access to the plug for adjustment.

'A plunger 28 is reciprocably mounted within the bore Il which as seen in Figure 3, is closed at one end, the open end being presented toward the inner guide strip I3, and is of a length slightly greater than the length of the plunger. A roller 29 is journalled in the outer end of the plunger 28 adapted to contact the inner guide 2 strip I3 and to impart movement to the plunger, as will be explained in greater detail hereinafter.

The plungers 2| and 28 are adapted to reciprocate in unison but in opposite directions, and for this purpose I provide a link 30 pivoted intermediate its length as at 3|. The ends of the links are slotted as at 32, and receive pins 33 of the respective plungers therethrough. The pins 33 occupy respective slots 20 and thus permit reciprocation of the plungers.

The sash has normally ,a limited lateral movement within the frame and it will thus be seen that wind pressure upon the weather side of the sash, as indicated by the arrows, will cause lateral movement of the sash toward the inner guide strip I3. Such movement will impart inward movement of the plunger 28 and by virtue of the link 30, the plunger 2 I will be drawn rearwardly so that the tooth 22 will be disengaged from the tooth of the rock bar 24, permitting the sash to move to its closed position by its own weight.

Obviously, the raising of the window sash is effected by pulling laterally inward upon the sash, such movement causing outward movement of the plunger 28 and inward movement of the plunger 2l, releasing the teeth 22-23. The sash is thus free to move to a desired position and upon release of the sash of lateral pressure, the spring 25 will project the plunger 2l to engage the tooth 22 with one of the teeth 23, thereby retaining the sash against downward movement until released by inward lateral pressure.

- I claim:-

1. In a sash, a fastenerV comprising a casting having a pair of parallel bores opening in opposite directions, a plunger member reciprocably mounted in each bore, one of said plungers having a tooth engageable with the teeth of a rack bar, the other plunger having sliding contact with a window frame, a pivotal link connecting the plungers, and spring means engaged with the iirst named plunger to project the same.

2. In ay sash, a fastener comprising a casting having a pair of parallel bores openingin opposite directionspa plunger member reciprocably mounted in each bore, one of said plungersy having a tooth engageable with the teeth of a rackL bar, the other plunger having sliding contact with a window frame, a pivoted link connecting the plungers, spring means engaged with the rstV named plunger to project the same, and means for adjusting the tension of the spring.

3. In a sash, a fastener comprising a casting having a pair of parallel bores opening in opposite directions', a plunger member reciprocably mounted in each bore and projectable therethrough, one of said plungers having a, tooth at its outer end for engagement with the teeth of a rack bar, the other plunger having a guide roller at the outer end thereof and in rolling contact With a window frame, a link member connecting the plunger members .and having a pivot intermediate its ends, spring means normally holding the plungers in projected positions, and means for adjusting the. tension, of the spring means.

4. In a sash, a fastener comprising a casting having a pair of parallel bores, opening in opposite directions, a plunger member reciprocably mounted in each bore and projectable therethrough, one of said plungers having a tooth at its outer end for engagement with the teeth of a rack bar, the other plunger having a guide roller at the outer end thereof and in rolling contact with a window frame, a link member connecting 20 ascrew-threaded plug engaged With the bore, and 25 in bearing contact with the spring.

JAMES A. DERSHEM. 

